Dam curtain grouting method and device

Abstract

The dam curtain grouting device comprises an orifice pipe and a sealer, the sealer is fixedly mounted at the bottom of the orifice pipe, an isolation plug is slidably arranged in the sealer, a fixing sleeve is rotatably mounted at the top of the sealer, and an outer ring of the sealer communicates with an outer expansion ring; the interior of the outer expansion ring communicates with an inner guide pipe and the exterior communicates with a slurry return pipe; the inner catheter penetrates through the isolation plug and is in sliding fit with the isolation plug; a guide cylinder is arranged at the bottom of the fixing sleeve, a pressing disc is slidably arranged in the fixing sleeve, a sealing piece is filled between the bottom of the pressing disc and the guide cylinder, multiple clamping rods are rotationally connected to the inner wall of the fixing sleeve, a pressing cylinder is in threaded fit with the top end of the fixing sleeve, and the pressing cylinder rotationally moves downwards to be used for enabling the clamping rods to rotate downwards to clamp a drill rod and meanwhile pressing down the pressing disc to force the sealing piece to deform. The sealing element, the fixing sleeve and other components do not need to be exposed in slurry, the better sealing effect is achieved, the sealing element is not abraded along with rotation, rotation is smooth, and meanwhile the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of curtain grouting, and particularly to a method and device for dam curtain grouting. Background Technique

[0002] Curtain grouting is to use a geological drill to drill holes in the formation to create suitable curtain holes, and then inject cement slurry with a relatively high pressure into the holes. After the cement slurry is injected, it will gradually penetrate into the cracks and pores of the rock mass or soil layer, slowly solidify together, and gradually form a continuous whole with the holes, and finally form a water-blocking curtain. The water-blocking curtain is a grouting project that reduces the seepage flow rate and the seepage pressure.

[0003] The curtain grouting of a water conservancy dam is generally carried out in a preset gallery. At the same time, the curtain grouting of a dam is generally relatively deep. Most of them adopt the orifice-closed circulation grouting method. Usually, grouting is carried out section by section from top to bottom to reach the required curtain grouting depth to obtain a better water-stop effect. That is to say, drilling and grouting are carried out alternately. The cement slurry in the drill hole is easy to solidify, and the drill pipe cannot rotate flexibly, which easily causes the drill pipe to be blocked in the hole and cause accidents in the hole. During the rotation of the drill pipe, the cylindrical base is in a static state. When the drill pipe rotates relative to the sealing component, friction will occur, resulting in a large resistance to the rotation of the drill pipe, serious wear of the sealing component, easy leakage of slurry, loose sealing and pressure relief, affecting the grouting quality, and also making the service life of the sealing component shorter and the replacement frequency higher, affecting the normal construction progress.

[0004] Based on this, the present invention designs a method and device for dam curtain grouting to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for dam curtain grouting to solve the problems in the above background technique that during the rotation of the drill pipe, the rotation resistance is relatively large, the sealing component is severely worn, easy to cause slurry leakage, loose sealing and pressure relief, affecting the grouting quality, and also making the service life of the sealing component shorter and the replacement frequency higher, affecting the normal construction progress.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: including an orifice pipe and a packer. The packer is fixedly installed at the bottom of the orifice pipe. An isolation plug is slidably arranged inside the packer, and a fixed sleeve is rotatably installed at the top. The fixed sleeve is used to connect the drill pipe and drive the drill pipe to rotate together. An outer expansion ring is communicated with the outer circle of the packer. An inner conduit is communicated with the inside of the outer expansion ring, and a return slurry pipe is communicated with the outside. The isolation plug is located at the bottom of the packer to isolate the bottom slurry and the upper space. The inner conduit passes through the isolation plug and is slidably matched with it. The bottom of the fixed sleeve is provided with a guide cylinder, and a pressing plate is slidably arranged inside. A sealing member is filled between the bottom of the pressing plate and the guide cylinder. A plurality of clamping rods are rotatably connected to the inner wall of the fixed sleeve. The top of the fixed sleeve is in threaded fit with a pressing cylinder. The pressing cylinder rotates downward to rotate the clamping rods downward to clamp the drill rod and at the same time press down the pressing plate to force the deformation of the sealing member.

[0007] As a further scheme of the present invention, a reinforcing plate is fixedly connected to the top of the orifice pipe, and the outer wall of the orifice pipe is in a tower shape. The orifice pipe is flange-connected to the bottom of the sealer through the reinforcing plate.

[0008] As a further scheme of the present invention, a closed expansion opening is provided at the inner top of the orifice pipe, a shrinkage ring is provided at the bottom of the sealer, and a sealing gasket is installed between the closed expansion opening and the shrinkage ring.

[0009] As a further scheme of the present invention, three through holes are opened inside the isolation plug. A filter plate is fixedly connected in the vertical hole section of the three through holes. The filter plate is located above the horizontal hole of the three through holes. A multi-purpose pipe is communicated with the side wall of the sealer. After the isolation plug is lifted, the horizontal hole of the three through holes is communicated with the multi-purpose pipe.

[0010] As a further scheme of the present invention, an extension ring is fixedly connected to the top of the pressing plate, an inner extension ring is fixedly connected to the bottom of the pressing cylinder, and the rod part of the clamping rod is located between the extension ring and the inner extension ring.

[0011] As a further scheme of the present invention, the sealing member includes a hollow deformation ring and an elastic sealing filler. The hollow deformation ring is located inside. The top and bottom of the hollow deformation ring are both arc-shaped arch surfaces.

[0012] As a further scheme of the present invention, an installation ring is fixedly connected to the inner top of the sealer. The fixed sleeve is installed on the top of the installation ring. A bearing cover is flange-connected to the top of the sealer. Bearing members are installed between the bearing cover and the fixed sleeve and between the fixed sleeve and the installation ring.

[0013] As a further scheme of the present invention, an open port matching the taper of the guide cylinder is provided in the inner circle of the installation ring, and a sealing rubber ring is provided between the two.

[0014] As a further scheme of the present invention, an external gear ring is fixedly connected to the outer circle of the fixed sleeve. The fixed sleeve is driven to rotate by an external motor through gear transmission.

[0015] A method for dam curtain grouting includes the following steps: After measurement and lofting, a hole matching the bottom of the orifice pipe is dug, and the orifice pipe is embedded by mortar masonry; Then the sealer is installed, the drill rod is inserted into the sealer, and drilling is carried out by a drilling rig; After drilling, carry out drilling cleaning and water pressure test; then start to prepare for grouting; Rotate the pressing cylinder downward to press down the clamping rod through the inner extension ring, so that the clamping rod clamps the drill pipe. At the same time, the pressure plate moves downward to press the lower seal, making the seal between the seal and the drill pipe tighter; Connect the drill pipe and the return slurry pipe to the grouting pump and start grouting. During the grouting process, the drill pipe can be rotated by the drill rig, and the fixed sleeve rotates together under the clamping of the clamping rod; In the initial stage of grouting, the air in the hole is discharged through the filter of the three-way hole until the hole is filled with slurry. The slurry jacks up the isolation plug until the three-way hole is connected to the multi-purpose pipe and the slurry is discharged. At this time, the hole is filled with slurry, and then the multi-purpose pipe is closed; Start circulating grouting. When the injection rate of the grouting hole section is not more than 1 L / min under the maximum design pressure, continue to grout for 30 min to end the grouting.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The existence of the isolation plug enables the first seal between the drill pipe and it, while isolating the bottom slurry from the upper space, so that components such as the seal and the fixed sleeve do not have to be exposed in the slurry, providing a more friendly sealing condition, making the closer and the seal have a better sealing effect, and also providing good working conditions for the rotation of the fixed sleeve.

[0017] 2. The seal does not rotate relative to the drill pipe and there is no rotational wear. After the circulating grouting is completed, by loosening the pressing cylinder upward, the clamping rod and the seal are released. At this time, drilling can continue, and at the same time, wear on the drill pipe and the seal is avoided, greatly increasing the service life of the seal. It is very suitable for segmented grouting to cope with the alternation of drilling and grouting, and has a good adaptability to deep grouting such as dam curtain grouting.

[0018] 3. Through the clamping connection of the clamping rod, the fixed sleeve can rotate together under both the active rotation and the passive rotation of the drill pipe, flexibly adapting to various production situations on the site, saving the investment in drill rigs and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the front view angle of the present invention; Figure 2 is the overall structural schematic diagram of the side and top view angles of the present invention; Figure 3 is the partial enlarged structural schematic diagram of the half-section of the side and top view angles of the present invention; Figure 4 is the present invention Figure 3 the enlarged structural schematic diagram of part A; Figure 5 is the half-section structural schematic diagram of the top view angle at the clamping rod of the present invention; Figure 6 Schematic diagram of the side perspective semi-section and enlarged detail structure of part B of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the upward movement structure of the inner isolation plug in part B of the present invention; Figure 8 Schematic diagram of the structure of the hollow deformation ring before and after deformation of the present invention.

[0020] In the attached drawings, the list of components represented by each reference numeral is as follows: 1. Orifice pipe; 2. Sealer; 3. Isolation plug; 4. Fixed sleeve; 5. Drill pipe; 6. Outer expansion ring; 7. Inner conduit; 8. Grout return pipe; 9. Guide cylinder; 10. Pressure plate; 11. Seal; 12. Clamping rod; 13. Compression cylinder; 14. Shrinkage ring; 15. Sealing washer; 16. Three-way hole; 17. Filter disc; 18. Multi-purpose pipe; 19. Extension ring; 20. Inner extension ring; 111. Hollow deformation ring; 112. Sealing packing; 23. Installation ring; 24. Bearing cover; 25. Outer gear ring. Detailed implementation manners

[0021] Please refer to Figure 1-8 , the working principle of the technical solution provided by the present invention is as follows: After measurement and lofting, a hole matching the bottom of the orifice pipe 1 is dug and the orifice pipe 1 is embedded by mortar grouting; since the orifice pipe 1 is of a tower-shaped structure, it can effectively withstand a large grouting pressure during pressure grouting, enhancing the stability of the orifice pipe 1.

[0022] The prepared sealing washer 15 is installed in the orifice pipe 1, and then the sealer 2 is sleeved on the reinforcement plate of the orifice pipe 1 and flange-connected. During the connection process, the sealer 2 gradually compresses the sealing washer 15, achieving the sealing between the sealer 2 and the orifice pipe 1 while installing and fixing the sealer 2. At the same time, flange connection is more convenient, without the problem of internal threads being exposed or contaminated, and the sealer 2 is more durable in use.

[0023] The drill pipe 5 is inserted into the sealer, and drilling is carried out by a drilling rig; after drilling, hole cleaning and water pressure test are carried out, and then grouting preparation begins; at this time, it is necessary to ensure the seal between the drill pipe 5 and the sealer 2 to ensure that the grouting pressure does not leak; by rotating the compression cylinder 13 downward and pressing the clamping rod 12 downward through the inner extension ring 20, the clamping rod 12 clamps the drill pipe 5, and at the same time the pressure plate 10 moves downward to compress the lower seal 11 below, making the seal between the seal 11 and the drill pipe 5 tighter, thereby achieving the seal between the drill pipe 5 and the sealer 2.

[0024] It should be noted that the presence of the isolation plug 3 isolates the bottom slurry from the upper space while forming the first seal with the drill rod 5, so that components such as the seal 11 and the fixed sleeve 4 do not have to be exposed to the slurry, providing more friendly sealing conditions, making the closure 2 have a better sealing effect, and also providing good working conditions for the rotation of the fixed sleeve 4.

[0025] The drill rod 5 and the grout return pipe 8 are connected to the grouting pump. First, the compression tube 13 is tightened downward. During the downward movement of the compression tube 13, the inner extension ring 20 gradually moves downward, thereby forcing the clamping rod 12 to rotate downward until the clamping rod 12 and the drill rod are attached and clamped. At this time, the clamping rod 12 clamps the drill rod 5. At the same time, during the downward rotation of the clamping rod 12, the pressure plate 10 is pressed downward by the extension ring 19, so that the pressure plate 10 presses the sealing member 11 more tightly and deforms at the same time, thereby forming a reliable extrusion seal with the drill rod, which greatly enhances the sealing performance of the sealer 2; Grouting is started through the drill rod 5. At the initial stage of grouting, the filter 17 cannot pass particulate matter (filter cloth can be used to achieve this). During the grouting process, the air in the hole is gradually forced out by the slurry pressure, and then is guided out through the filter 17 of the three-way hole 16 until the slurry in the hole reaches the isolation plug 3. Grouting continues, and the slurry pushes the isolation plug 3 upward. When the isolation plug 3 just reaches the bend of the inner guide tube 7, the isolation plug 3 moves to the three-way hole 16 and is connected to the multi-purpose tube 18, and then the slurry is discharged, indicating that the hole is full of slurry at this time. The multi-purpose tube 18 can be closed, and then it can be clearly sensed when the slurry in the hole is full. It is relatively simple and convenient. It can be sensed immediately when the hole is full, avoiding slurry waste and facilitating the start of formal circulation grouting. The valve installed on the multi-purpose tube 18 can also be used as an overflow pipe in the future to adjust and control the circulation grouting pressure. At the same time, an overflow valve can also be set on the return grout pipe 8; During the grouting process, the drill rod 5 can be rotated by the drilling rig, and the fixing sleeve 4 is clamped by the clamping rod 12 to make the fixing sleeve 4 rotate along with the drill rod 5. At this time, the sealing member 11 does not rotate relative to the drill rod 5, and there is no rotational wear. The rotation of the fixing sleeve 4 is forcibly driven by the clamping of the clamping rod 12, so there is relatively no slipping between the drill rod 5 and the sealing member 11. After the cyclic grouting is completed, the clamping rod 12 and the sealing member 11 can be released by loosening the clamping cylinder 13 upwards, and the drilling can be continued at this time. During the up and down movement of the drill rod 5, wear on the drill rod 5 and the sealing member 11 is avoided, and the service life of the sealing member 11 is greatly enhanced. The invention is very suitable for segmented grouting, and can cope with the alternation of drilling and grouting. It has a good adaptability to deep grouting such as dam curtain grouting.

[0026] When starting cyclic grouting, the grout is injected from the drill pipe 5, enters the outer expansion ring 6 through the inner conduit 7, and then discharges through the return grout pipe 8 to achieve cyclic grouting. The cooperation between the inner conduit 7 and the isolation plug 3 provides a good return grout space during grout return and also provides the premise for isolating the grout from the upper space. When the injection rate of the grouting hole section is not greater than 1 L / min under the maximum design pressure and continues to be grouted for 30 min, the grouting can be ended.

[0027] Specifically, the drive of the fixed sleeve 4 can be achieved by rotating the drill pipe 5 through the drill rig, thereby driving the fixed sleeve 4 to rotate accordingly. In the last hole section, the drill rig can also be removed in advance, and the fixed sleeve 4 is actively rotated through the external motor via gear transmission through the external gear ring 25, thereby driving the drill pipe 5 to rotate, avoiding pipe blockage. Through the clamping connection of the clamping rod 12, the fixed sleeve 4 can rotate together under both the active rotation and passive rotation of the drill pipe 5, flexibly adapting to various production situations on the site, saving the investment in drill rigs and improving efficiency.

[0028] Specifically, when the pressure plate 10 presses downward, the deformation of the hollow deformation ring 111 before and after deformation is as Figure 8 shown in the left and right examples below. The deformed one is the right figure. The top and bottom planes of the hollow deformation ring 111 are flatter, the inner side is more prominent, it fits more closely to the drill pipe 5 and has a better contact sealing effect with the pressure plate 10 and the bottom seal. Under the elastic deformation of the external sealing filler 112, it fills the gaps and provides uniform and comprehensive pressure, further enhancing the sealing performance of the entire seal 11.

[0029] Specifically, the conical guide tube 5 has a good downward guiding effect when the pressure plate 10 compresses the seal 11 and deforms it, making the deformation direction of the seal more concentrated in the downward and middle directions, thereby providing a better and tighter sealing effect. At the same time, it has a good bearing capacity for the drill pipe 5 and a certain guiding vertical effect. When the fixed sleeve 4 rotates, bearings are provided both above and below its base, making the rotation smoother, and the follow-up rotation effect of the fixed sleeve 4 and the drill pipe 5 is better and more sensitive.

Claims

1. A dam curtain grouting device, comprising an orifice pipe (1) and a packer (2), characterized in that: The plugging device (2) is fixedly installed at the bottom of the orifice pipe (1). A partition plug (3) is slidably arranged inside the plugging device (2), and a fixing sleeve (4) is rotatably installed at the top. The fixing sleeve (4) is used to connect the drill pipe (5) and drive the drill pipe (5) to rotate together. An expanding ring (6) is communicated with the outer ring of the plugging device (2). An inner conduit (7) is communicated with the inside of the expanding ring (6), and a slurry return pipe (8) is communicated with the outside thereof; The partition plug (3) is located at the bottom of the plugging device (2) for isolating the bottom slurry and the upper space. The inner conduit (7) passes through the partition plug (3) and is in sliding fit therewith; A guiding cylinder (9) is arranged at the bottom of the fixing sleeve (4), and a pressing disc (10) is slidably arranged inside. A sealing member (11) is filled between the bottom of the pressing disc (10) and the guiding cylinder (9). A plurality of clamping rods (12) are rotatably connected to the inner wall of the fixing sleeve (4). A pressing cylinder (13) is in threaded fit with the top end of the fixing sleeve (4). The pressing cylinder (13) rotates downward to rotate the clamping rods (12) downward to clamp the drill pipe (5) and simultaneously press down the pressing disc (10) to force the sealing member (11) to deform.

2. The dam curtain grouting device according to claim 1, characterized in that: A reinforcing disc is fixedly connected to the top of the orifice pipe (1), and the outer wall of the orifice pipe (1) is in a tower shape. The orifice pipe (1) is flange-connected to the bottom of the plugging device (2) through the reinforcing disc.

3. The dam curtain grouting device according to claim 2, characterized in that: A closed expansion opening is arranged at the inner top end of the orifice pipe (1), and a shrinkage ring (14) is arranged at the bottom of the plugging device (2). A sealing washer (15) is installed between the closed expansion opening and the shrinkage ring (14).

4. A dam curtain grouting device according to claim 1, characterized in that: Three through holes (16) are formed inside the partition plug (3). A filter disc (17) is fixedly connected to the vertical hole section of the three through holes (16). The filter disc (17) is located above the transverse hole of the three through holes (16). A multi-purpose pipe (18) is communicated with the side wall of the plugging device (2). After the partition plug (3) moves upward, the transverse hole of the three through holes (16) is communicated with the multi-purpose pipe (18).

5. A dam curtain grouting device according to claim 1, characterized in that: An extension ring (19) is fixedly connected to the top of the pressing disc (10), and an inner extension ring (20) is fixedly connected to the bottom of the pressing cylinder (13). The rod part of the clamping rod (12) is located between the extension ring (19) and the inner extension ring (20).

6. The dam curtain grouting device according to claim 1, characterized in that: The sealing member (11) includes a hollow deformation ring (111) and an elastic sealing filler (112). The hollow deformation ring (111) is located inside. The top end and the bottom end of the hollow deformation ring (111) are both arc-shaped arch surfaces.

7. A dam curtain grouting device according to claim 1, characterized in that: An installation ring (23) is fixedly connected to the inner top of the plugging device (2). The fixing sleeve (4) is installed on the top of the installation ring (23). A bearing cover (24) is flange-connected to the top of the plugging device (2). Bearing parts are installed between the bearing cover (24) and the fixing sleeve (4) and between the fixing sleeve (4) and the installation ring (23).

8. The dam curtain grouting device according to claim 7, characterized in that: An open port with a taper matching that of the guiding cylinder (9) is arranged on the inner ring of the installation ring (23), and a sealing rubber ring is arranged therebetween.

9. The dam curtain grouting device according to claim 1, characterized in that: An external gear ring (26) is fixedly connected to the outer ring of the fixing sleeve (4). The fixing sleeve (4) is driven to rotate by an external motor through gear transmission.

10. A method for curtain grouting of a dam, comprising any one of the grouting devices described in claims 1-9, characterized in that, Including the following steps: S1: After measurement and layout, dig a hole matching the bottom of the orifice pipe (1), and embed and install the orifice pipe (1) by mortar. S2: Then install the plug (2), insert the drill pipe (5) into the plug, and drill a hole with a drilling rig. S3: After drilling, conduct hole cleaning and water pressure test; then start preparing for grouting. S4: Rotate the pressing cylinder (13) downward to press down and rotate the clamping rod (12) through the inner extension ring (20), so that the clamping rod (12) clamps the drill pipe (5). At the same time, the pressure plate (10) moves downward to press the lower seal (11), making the seal between the seal (11) and the drill pipe (5) tighter. S5: Connect the drill pipe (5) and the return grout pipe (8) to the grouting pump, and start grouting. During the grouting process, the drill pipe (5) can be rotated by the drilling rig, and the fixed sleeve (4) rotates together under the clamping of the clamping rod (12). S6: In the initial stage of grouting, the air in the hole is discharged through the filter (17) of the three-way hole (16) until the hole is filled with grout. The grout jacks up the isolation plug (3) until the three-way hole (16) communicates with the multi-purpose pipe (18) and discharges the grout. At this time, the hole is filled with grout, and then the multi-purpose pipe (18) is closed. S7: Start circulating grouting. When the injection rate of the grouting hole section is not more than 1 L / min under the maximum design pressure, continue grouting for 30 min to end the grouting.

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